yup, don't over or under eat, consume a balanced amount of carbs and protien (carbs should be the bulk of your diet, mainly complex) and a variety of fruit and veg for vitamins and minerals and you'll be OK.

I normaly hate to quote clicky health sayings etc but '5 a day' :P make sure you get 5 varied portions of fruit and veg and you should cover the vitamins you need.